$Z_H\to H^0\gamma$ decay within the littlest Higgs model at $\mathcal{O}({\alpha }_{\mathrm{ew}}^3{\alpha }_s)$ accuracy

Abstract

We study the rare decay $Z_H\to H^0\gamma$ at $\mathcal{O}({\alpha }_{\mathrm{ew}}^3{\alpha }_s)$ accuracy including two-loop QCD corrections in the context of the littlest Higgs model (LHM) without $T$-parity. We revisit analytically and numerically the leading-order (LO) contributions of the one-loop diagrams induced by massive fermions, scalars and charged gauge bosons in the LHM, and further study the NLO QCD correction to this decay process. We perform the numerical calculation by taking the LHM input parameters $f=3,4\text{TeV}$ and $0.1<c<0.6$, and discuss the numerical results of the decay width up to the QCD NLO within the recent experimentally constrained LHM parameter space region. Our results show that the two-loop QCD correction always reduces the LO decay width and the top-induced QCD correction is the dominant contribution at the QCD NLO. For $f=4\text{TeV}$ and $c=0.3$, the NLO QCD corrected decay width reaches $75.099\text{keV}$ and the NLO QCD relative correction is about $-11.0\%$.

arXiv comment25 pages, 5 figures

References in corpus (36)

• Generating Feynman Diagrams and Amplitudes with FeynArts 3
• The Physics of Heavy Z' Gauge Bosons
• Electroweak symmetry breaking from dimensional deconstruction
• New Developments in FeynCalc 9.0
• Strong Dynamics and Electroweak Symmetry Breaking
• (De)Constructing Dimensions
• $SU(3)\otimes U(1)$ Model for Electroweak Interactions
• RunDec: a Mathematica package for running and decoupling of the strong coupling and quark masses
• Phenomenology of the Little Higgs Model
• The Phenomenology of Extra Neutral Gauge Bosons
• FIRE5: a C++ implementation of Feynman Integral REduction
• Gauge Invariant Effective Lagrangian for Kaluza-Klein Modes
• Search for high-mass dilepton resonances using 139 fb${}^{-1}$ of $pp$ collision data collected at $\sqrt{s}=$13 TeV with the ATLAS detector
• Little Higgses from an Antisymmetric Condensate
• Big Corrections from a Little Higgs
• FIESTA 4: optimized Feynman integral calculations with GPU support
• Electroweak Breaking and the mu problem in Supergravity Models with an Additional U(1)
• Implications of Abelian Extended Gauge Structures From String Models
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Two-loop QCD Corrections to the Heavy Quark Form Factors: the Vector Contributions
• Effects of SM Kaluza-Klein excitations on electroweak observables
• Odeint - Solving ordinary differential equations in C++
• Introducing the Little Higgs
• Loop induced decays of the Little Higgs: H --> gg, gamma gamma
• The Higgs - photon - Z boson coupling revisited
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector using 4.6 fb-1
• Z' Discovery Limits For Supersymmetric E_6 Models
• Higgs Boson Production and Decay: Dalitz Sector
• Precision predictions for Z'-production at the CERN LHC: QCD matrix elements, parton showers, and joint resummation
• Can the 125 GeV Higgs be the Little Higgs?
• Evaluating multi-loop Feynman integrals numerically through differential equations
• Higgs boson decays in the littlest Higss model
• The LHC di-photon Higgs signal predicted by little Higgs models
• Higgs-photon associated production at hadron colliders
• The $Z_H\to \gamma H$ decay in the Littlest Higgs Model
• Radiative decays Z_H-> V_i Z (V_i=γ, Z) in little Higgs models

Cited by in corpus (1)

• Phenomenological implications of the new Littlest Higgs model with T-parity